ROCKFORD — Top-seeded Auburn and fourth-seeded Keith won regional championships Monday as the Illinois High School Association Scholastic Bowl tournament series opened.

Each advanced to the sectional tournaments they will host Saturday’s for Class AA and Class A, respectively.

Auburn will be trying to reach the state tournament for the 13th consecutive year. Keith will be aiming for its fourth straight trip.

Auburn will be joined by No. 2 seed Kaneland, No. 5 seed Woodstock Marian and unseeded Cary-Grove in the Auburn sectional. Kaneland won the Maple Park regional; Woodstock Marian, the Boylan regional; and Cary-Grove, the Belvidere North regional. No. 3 Boylan was upset in the first round, while Cary-Grove knocked off No. 4 Crystal Lake South and No. 7 Belvidere North en route to its title.

Keith will entertain top-seeded Sterling Newman, No. 3 Morrison and No. 5 Galena. Newman and Morrison won their regionals, while Galena won at Lena-Winslow, where the host school was the No. 2 seed and upset in the semifinals.